Purchase signals Southeast Asian state’s efforts to boost its capabilities and the inroads Chinese drones are making in some markets.

The move indicates Jakarta’s insistence on pursuing what has become a key priority.

Beijing’s displeasure is all too predictable and far from convincing.

Jakarta is willing to take new moves to signal even more clearly its long-held legal positions.

The drills (though far more routine than headlines suggest) show that Jakarta is determined to protect its interests.

Sinkings described as low-key, with identities of the vessels not publicly disclosed.